stm32定义TIM7定时器代码

解析：这个query需要生成STM32的TIM7定时器定义代码。

以下是STM32定义TIM7定时器的代码：

```c
#include "stm32f10x.h"

void TIM7_Init(u16 arr, u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

// 使能TIM7时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM7, ENABLE);

// 配置TIM7参数
TIM_TimeBaseStructure.TIM_Period = arr; // 自动重装载值
TIM_TimeBaseStructure.TIM_Prescaler = psc; // 预分频系数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // 时钟分频因子
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 向上计数模式
TIM_TimeBaseInit(TIM7, &TIM_TimeBaseStructure);

// 使能TIM7更新中断
TIM_ITConfig(TIM7, TIM_IT_Update, ENABLE);

// 配置NVIC中断优先级
NVIC_InitStructure.NVIC_IRQChannel = TIM7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //响应优先级1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

// 使能TIM7
TIM_Cmd(TIM7, ENABLE);
}
```